This is a simple project to diy a LiOH battery cell charger from a cheap external battery pack (which wasn't even in the capacity described in the listing).
I probably don't need to remind that damaging lithium batteries can burn your house down...so be careful!
I only used the charging board, so removed the battery cells.
I took the battery terminals from a battery powered lights. The case is still good enough although a bit too small.
Using some wooden knives I made a simple frame to hold a battery and, with the terminals, for it to be easily removed when charged.
The case was a bit too small for the battery, so a little extension was necessary.
The battery terminals and the frame is simply glued with hot glue and seem to hold together well. The positve (red) and the negative (black) wires I soldered to the terminals so that they don't obstruct the removal of the battery.
Lastly the frame is glued to the case with hot glue, which again seems to hold together well.
Remember that the LiOH battery cell has to be placed correctly, with the positive side to the positive terminal and the negative side to the negative terminal. You can check which side of the battery is the positive one by measuring the voltage with a multimeter.
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